class Node(object):
    def __init__(self,value):
        self.value=value
        self.lchild=None
        self.rchild=None
class Tree(object):
    def __init__(self):
        self.root=None
    def add(self,value):
        node=Node(value)
        queen=[self.root]
        while queen:
            curnode=queen.pop(0)
            



